Here are the answers to the multiple-choice questions. Question 26: The question is partially obscured, but based on the options, it likely asks about a constitution of Nigeria. Assuming it asks about the current constitution of Nigeria, or a significant one among the options. The current constitution of Nigeria is the 1999 Constitution. The final answer is $\boxed{\text{D. 1999 Constitution}}$. Question 27: The primary purpose of Judicial Review is to ensure that laws and government actions comply with the constitution. The final answer is $\boxed{\text{B. Determine the constitutionality of the actions of the executive and legislature}}$. Question 28: In the Oyo Empire, the Oyo Mesi was the council of seven kingmakers who served as a check on the powers of the Alaafin. The final answer is $\boxed{\text{C. Oyo Mesi}}$. Question 29: The policy of assimilation, which aimed to integrate colonial subjects into the culture and administration of the colonizing power, was primarily used by the French in their West African colonies. The final answer is $\boxed{\text{B. French}}$. Question 30: The United Nations Organization (UNO) has its headquarters in New York City, USA. The final answer is $\boxed{\text{C. New York (USA)}}$.